Airborne fan product performance test bench

Abstract

The invention relates to the technical field of fan performance testing, in particular to an airborne fan product performance test bench, which is characterized in that a circulating pipeline is connected with a regulating valve, an upstream static pressure sensor and a downstream static pressure sensor which are respectively arranged at two sides of an installation position, a total pressure sensor is arranged at the downstream of the installation position, and a downstream temperature sensor is arranged at the downstream of the installation position; the control and display cabinet is opposite to the downstream static pressure sensor and is connected with the upstream static pressure sensor, the downstream static pressure sensor, the total pressure sensor and the downstream temperature sensor. The volume flow of the tested fan is obtained; according to the corresponding relation between the multiple sets of pressure differences and the volume flow, the fitting curve of the pressure differences and the volume flow of the tested fan in the current environment is obtained through fitting, the aerodynamic performance of the fan can be effectively evaluated, and therefore the design is optimized, and the working efficiency of the fan is improved.

Description

Technical Field

[0001] The present application relates to the technical field of fan performance testing, and in particular to a performance test bench for airborne fan products. Background Art

[0002] At present, the fans used for ventilation or heat dissipation on aircraft are mainly axial flow fans. With the weight reduction design and compact structure design of the system and aircraft, the diameter of the pipe is gradually reduced, resulting in increasing resistance of the system pipe and increasing pressure rise requirements of the fan. Ordinary axial flow fans can no longer meet the requirements. Centrifugal fans are large in size and bulky, making them difficult to use on board. Diagonal flow fans have the characteristics of both axial flow and centrifugal fans, with compact structure and high pressure rise, and have begun to be widely used on board. With the development of technology, airborne products have higher requirements for their efficiency. High-efficiency products can reduce energy consumption, reduce aircraft flight costs and increase cruising range, so it is critical for airborne fans to improve work efficiency.

[0003] An existing fan performance test system consists of an upstream ultrasonic transducer, a downstream ultrasonic transducer, a static pressure gauge, a multi-leaf valve and an auxiliary fan. Its main structure includes a contraction section, a metering section and a diffusion section. The contraction section is used to install the fan under test, while the upstream and downstream ultrasonic transducers are installed at a 45-degree angle on both sides of the metering section, and the wind speed of the fan is measured using the ultrasonic time difference method. The pressure gauge is installed at the opening above the metering section to measure the static pressure of the fan. By adjusting the opening and closing angle of the multi-leaf valve and the power of the auxiliary fan, the system can test and evaluate the fan at different operating points. When the fan is running, it will inevitably bring about a pressure difference between the upstream and downstream of the fan, thereby affecting the airflow driven by the fan. Therefore, in addition to the need to pressure test fans under different operating conditions, it is also necessary to effectively evaluate the aerodynamic performance of the fan. Summary of the invention

[0004] In order to solve the above problems, the present application provides an airborne fan product performance test bench.

[0005] The airborne fan product performance test bench provided in this application adopts the following technical solution:

[0006] A performance test bench for airborne fan products, comprising:

[0007] A circulation duct connected with an adjusting valve, wherein a mounting position of a tested fan is arranged in the circulation duct;

[0008] The upstream static pressure sensor and the downstream static pressure sensor are respectively arranged on both sides of the installation position, and are used to measure the static pressure upstream and downstream of the tested fan. The difference between the static pressure upstream and downstream of the tested fan is the pressure difference.

[0009] A total pressure sensor is disposed downstream of the installation position to measure the total pressure in the circulation pipeline;

[0010] A downstream temperature sensor is arranged downstream of the installation position, opposite to the downstream static pressure sensor, and is used to measure the static temperature at the test section where the downstream static pressure sensor is located;

[0011] The control and display cabinet is connected to the upstream static pressure sensor, the downstream static pressure sensor, the total pressure sensor, and the downstream temperature sensor; it is used to obtain the volume flow rate of the tested fan according to the inner diameter of the circulation pipeline, the total pressure in the circulation pipeline, the static pressure upstream and downstream of the tested fan, and the static temperature at the test section where the downstream static pressure sensor is located; according to the corresponding relationship between multiple groups of pressure differences and volume flow rates, a fitting curve of the pressure difference and volume flow rate of the tested fan in the current environment is fitted.

[0012] By adopting the above technical solution, the static pressure upstream and downstream of the fan, the total pressure in the circulation duct and the static temperature downstream can be accurately measured and controlled, the volume flow rate of the tested fan can be accurately calculated, and the performance curve of the fan under a specific environment can be fitted according to the corresponding relationship between multiple sets of pressure differences and volume flow rates. This not only improves the accuracy and reliability of the test, but also can comprehensively evaluate the performance changes of the fan under different working conditions, thereby optimizing the design and improving the working efficiency of the fan.

[0013] Optionally, the control and display cabinet is also used to connect to the test fan, change the speed of the test fan, and fit a family of fitting curves of the pressure difference and volume flow of the test fan under different speed conditions in the current environment according to the corresponding relationship between the pressure difference and the volume flow under different speed conditions.

[0014] By adopting the above technical solution, changing the speed of the tested fan, and fitting the pressure difference and volume flow rate fitting curve family according to the corresponding relationship between the pressure difference and volume flow rate under different speed conditions, it is possible to achieve a comprehensive evaluation and optimization of the fan performance. Performance testing based on speed changes can provide important data support for the design and improvement of fans, help to better understand the performance characteristics of fans at different working points, and then optimize fan design and improve its efficiency and reliability in practical applications.

[0015] Optionally, the circulation pipeline is provided with an air outlet and an air inlet, and the system further comprises:

[0016] A vacuum pump, connected to the gas outlet through a gas outlet pipe, for extracting gas from the circulation pipeline;

[0017] An air supply pipe is communicated with the air inlet, and an air supply valve is provided on the air supply pipe.

[0018] By adopting the above technical solution, the vacuum pump is connected to the air outlet through the air outlet pipe to extract the gas in the circulation pipeline, thereby reducing the gas pressure in the pipeline and simulating different working altitudes and environmental conditions. The air supply pipe is connected to the air inlet and is equipped with an air supply valve, which can add gas to the circulation pipeline when necessary to adjust the gas pressure and density in the pipeline. In this way, the test bench can more realistically reproduce the various environmental conditions that the fan may encounter in actual work, providing strong support for the performance testing and optimization of the fan.

[0019] Optionally, a heater is provided on the circulation pipeline.

[0020] By adopting the above technical solution, the heater can quickly heat up and maintain a constant temperature by directly heating the gas in the circulation pipe. It can accurately control the temperature in the circulation pipe and simulate various temperature conditions that the fan may encounter in actual work, providing strong support for the performance testing and optimization of the fan.

[0021] Optionally, a refrigeration subsystem is also included, and the refrigeration subsystem includes an evaporator, an electronic expansion valve, a condenser and a compressor that are connected to each other, and the evaporator is connected to the circulation pipeline.

[0022] By adopting the above technical solution, the refrigeration subsystem can quickly cool down and maintain a constant temperature by directly cooling the gas in the circulation pipe. It can accurately control the temperature in the circulation pipe and simulate various temperature conditions that the fan may encounter in actual work, providing strong support for the performance testing and optimization of the fan.

[0023] Optionally, a sealed tank is further included, wherein the sealed tank includes a tank body and a partition fixed inside the tank body, and the partition is communicated with the inside and outside of the tank body to form the circulation pipeline inside the tank body.

[0024] By adopting the above technical solution, the design of the sealing tank ensures the sealing of the circulation pipeline and prevents gas leakage, which is crucial to maintaining a stable test environment in the pipeline. The sealing tank has a simple and reasonable structure, convenient processing, high production efficiency, good sealing effect, and is firm and durable. Secondly, the setting of the partition allows the circulation pipeline to form a closed loop in the tank body, which helps to achieve uniform distribution and circulation of gas flow, thereby ensuring the stability and repeatability of the airflow during the test. This not only improves the safety and reliability of the test bench, but also helps to achieve precise control of fan performance testing, providing a stable and controllable test environment for fan performance evaluation under different working conditions.

[0025] Optionally, the separator is a separator tube with openings at both ends, which is arranged in the middle of the tank body, and a mounting position for the tested fan is provided in the separator tube.

[0026] By adopting the above technical solution, placing the separation tube in the middle of the tank and opening both ends, the internal space of the tank can be effectively divided into two independent airflow channels, thereby forming a stable airflow circulation in the circulation duct and providing a uniform test environment for the fan. Secondly, installing the tested fan in the separation tube can ensure that the fan is directly affected by the circulating airflow, making the test results more accurate and reliable.

[0027] Optionally, it also includes an upstream temperature sensor, which is arranged upstream of the installation position and is used to measure the static temperature upstream of the installation position. The control and display cabinet is connected to the upstream temperature sensor and is used to obtain the temperature rise of the test fan under different pressure differences and different flow conditions based on the static temperatures upstream and downstream of the installation position.

[0028] By adopting the above technical solution, the upstream temperature sensor is set upstream of the installation position and connected to the control and display cabinet, which can accurately measure the static temperature upstream of the tested fan, which is crucial for evaluating the performance of the fan under different working conditions. By comparing the static temperatures upstream and downstream, the temperature rise of the fan can be accurately calculated, thereby evaluating the thermal performance of the fan under different pressure difference and flow conditions.

[0029] Optionally, it also includes an ammeter and a voltmeter electrically connected to the test fan to measure the current and voltage of the test fan. The control and display cabinet is connected to the ammeter and voltmeter to obtain the efficiency curve of the test fan based on the current and voltage of the test fan, the pressure difference of the test fan, and the flow rate.

[0030] By adopting the above technical solution, adding an ammeter and a voltmeter to the test system to measure the current and voltage of the tested fan, and connecting these data with the control and display cabinet, an accurate evaluation of the fan efficiency can be achieved.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The volume flow rate of the tested fan is obtained based on the inner diameter of the circulation duct, the total pressure in the circulation duct, the static pressure upstream and downstream of the tested fan, and the static temperature at the test section where the downstream static pressure sensor is located; based on the corresponding relationship between multiple sets of pressure difference and volume flow rate, the fitting curve of the pressure difference and volume flow rate of the tested fan in the current environment is fitted, which can effectively evaluate the aerodynamic performance of the fan, thereby optimizing the design and improving the working efficiency of the fan;

[0033] 2. Change the speed of the tested fan, and according to the corresponding relationship between the pressure difference and volume flow rate under different speed conditions, fit the fitting curve family of the pressure difference and volume flow rate of the tested fan under different speed conditions in the current environment, so as to achieve a comprehensive evaluation and optimization of the fan performance based on the speed change, and provide important data support for the design and improvement of the fan;

[0034] 3. A heater and refrigeration subsystem are installed on the circulation pipe, which can simulate various temperature conditions that the fan may encounter in actual work. The temperature simulation range is -55℃~95℃, which provides strong support for the performance test and optimization of the fan;

[0035] 4. The circulation pipeline is connected with the vacuum pump and the air supply pipe, which can simulate different working altitudes and environmental conditions. According to the different maximum pumping speeds of the vacuum pump, the maximum simulated altitude can reach 20km. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of an airborne fan product performance test bench in an embodiment of the present application;

[0037] Figure 2 It is a schematic diagram of the structure of the tank body in the embodiment of the present application.

[0038] Description of reference numerals:

[0039] 100. Tested fan;

[0040] 11. Circulation pipeline; 111. Tank body; 111a. Upper tank body; 111b. Lower tank body; 111c. Vacuum sealing flange; 112. Partition; 12. Adjusting valve; 13. Vacuum pump; 14. Air supply pipe; 15. Air supply valve; 16. Heater; 17. Refrigeration subsystem; 171. Evaporator; 172. Electronic expansion valve; 173. Condenser; 174. Compressor; 18. Control and display cabinet;

[0041] 21. Upstream static pressure sensor; 22. Downstream static pressure sensor; 23. Total pressure sensor;

[0042] 31. Upstream temperature sensor; 32. Downstream temperature sensor. DETAILED DESCRIPTION

[0043] The following will be combined with the attached Figure 1-2 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0044] The present application embodiment discloses a performance test bench for airborne fan products. Figure 1The performance test bench for airborne fan products includes a circulation duct 11, in which a mounting position for a test fan 100 is provided. An adjusting valve 12 is connected to the circulation duct 11. By adjusting the opening and closing angle of the valve 12, the back pressure of the test fan 100 can be changed, thereby achieving the purpose of changing the total pressure head and flow rate of the test fan 100.

[0045] In one embodiment, the circulation pipeline 11 may be an annular sealed pipeline. In this embodiment, the circulation pipeline 11 is formed by a sealed tank. Figure 2 The sealed tank includes a tank body 111 and a partition 112 fixed in the tank body 111. The tank body 111 includes an upper tank body 111a and a lower tank body 111b. The upper tank body 111a and the lower tank body 111b are connected by a vacuum sealing flange 111c to achieve sealing.

[0046] The partition 112 is located in the tank 111, dividing the tank 111 into two areas. The inside and outside of the partition 112 are connected to form a circulation pipe 11 inside the tank 111. Specifically, in this embodiment, the partition 112 is a partition tube with openings at both ends, which is arranged in the middle of the tank 111, and the installation position of the tested fan 100 is arranged in the partition tube. Figure 1 The tank body 111 is provided with an air inlet at a position opposite to the separation pipe, and the air supply pipe 14 is connected to the air inlet, and the air supply pipe 14 is provided with an air supply valve 15. The tank body 111 is provided with an air outlet at a position staggered from the separation pipe, and the vacuum pump 13 is connected to the air outlet through the air outlet pipe, which is used to extract gas from the circulation pipe 11.

[0047] Start the tested fan 100, and the gas flows from the separator tube to the outside of the separator tube, and then flows back to the separator tube to form a circulating airflow. Close the air supply valve 15, and use the vacuum pump 13 to extract the gas in the tank body 111, which can change the gas rarefaction in the tank body 111 and simulate the fan working height. According to the different maximum pumping speeds of the vacuum pump 13, the maximum simulated height can reach 20km.

[0048] Reference Figure 1 , a heater 16 and a refrigeration subsystem 17 are provided on the circulation pipe 11. Specifically, the heater 16 is annular and fixed to the periphery of the end of the separation pipe. The refrigeration subsystem 17 includes an evaporator 171, an electronic expansion valve 172, a condenser 173 and a compressor 174 that are connected. The evaporator 171 is provided between the separation pipe and the tank body 111. Turning on the heater 16 can heat the gas in the tank body 111, and turning on the refrigeration subsystem 17 can cool the gas in the tank body 111. The temperature of the fan working environment is simulated, and the simulated temperature range is -55°C to 95°C.

[0049] The upstream static pressure sensor 21 and the downstream static pressure sensor 22 are respectively arranged on both sides of the installation position, and are used to measure the static pressure upstream and downstream of the test fan 100. The difference between the static pressure P1 upstream of the test fan 100 and the static pressure P2 downstream of the test fan 100 is the pressure difference ΔP=P2-P1.

[0050] The total pressure sensor 23 is disposed downstream of the installation position to measure the total pressure P* in the circulation pipe 11 .

[0051] The upstream temperature sensor 31 is arranged upstream of the installation position, and is used to measure the static temperature T1 upstream of the installation position. The downstream temperature sensor 32 is arranged downstream of the installation position, opposite to the downstream static pressure sensor 22, and is used to measure the static temperature T2 at the test section where the downstream static pressure sensor 22 is located.

[0052] The control and display cabinet 18 is connected to the upstream static pressure sensor 21, the downstream static pressure sensor 22, the total pressure sensor 23, the upstream temperature sensor 31, and the downstream temperature sensor 32. The control and display cabinet 18 is used to obtain the volume flow Q of the tested fan 100 according to the inner diameter d of the circulation duct 11, the total pressure P* in the circulation duct 11, the static pressure P1 upstream of the tested fan 100, the static pressure P2 downstream of the tested fan 100, and the static temperature T2 at the test section where the downstream static pressure sensor 22 is located.

[0053] The volume flow rate Q is calculated as:

[0054]

[0055] Where: Q is the volume flow rate of the tested fan 100, unit: m 3 / s;

[0056] d is the inner diameter of the separator tube, in m;

[0057] P* is the total pressure in the circulation pipeline 11, in Pa;

[0058] P2 and T2 are the static pressure (unit Pa) and static temperature (unit K) at the same test section, respectively.

[0059] By adjusting the regulating valve 12 on the circulation pipe 11, each time the angle of the regulating valve 12 is changed, a group of ΔP and Q values ​​of the test fan 100 are obtained. According to the corresponding relationship between multiple groups of pressure difference ΔP and volume flow rate Q, a fitting curve of the pressure difference and volume flow rate of the test fan 100 in the current environment (simulated altitude and simulated temperature) is fitted, and fitting methods such as least squares method can be used.

[0060] The test system also includes an ammeter and a voltmeter electrically connected to the test fan 100 to measure the current and voltage of the test fan 100. The control and display cabinet 18 is connected to the ammeter and the voltmeter to obtain the efficiency curve of the test fan 100 based on the current and voltage of the test fan 100, the pressure difference of the test fan 100, and the flow rate.

[0061] The formula for efficiency is:

[0062] Where: is the efficiency of the tested fan 100;

[0063] ΔP is the pressure difference between the upstream and downstream of the tested fan 100;

[0064] Q is the volume flow rate of the tested fan 100;

[0065] I is the current of the tested fan 100;

[0066] U is the voltage of the tested fan 100.

[0067] The control and display cabinet 18 is also used to connect with the test fan 100. For the variable frequency speed regulating fan, the speed of the test fan 100 is changed by the control and display cabinet 18 (the corresponding current can be adjusted). According to the corresponding relationship between the pressure difference and the volume flow rate under different speed conditions, a family of fitting curves of the pressure difference and the volume flow rate of the test fan 100 under different speed conditions in the current environment (simulated altitude and simulated temperature) is fitted and plotted in the same coordinate system.

[0068] According to different uses, equal flow curves and equal pressure head curves can be formed, and the flow requirements corresponding to the heat load values ​​of the cooled objects at different heights can be calculated.

[0069] The control and display cabinet 18 is used to obtain the temperature rise ΔT=T2-T1 of the tested fan 100 under different pressure differences and different flow conditions according to the static temperatures upstream and downstream of the installation position.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0072] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A performance test bench for airborne fan products, characterized in that: include: A circulation pipe (11) is connected to an adjusting valve (12), and a mounting position for a tested fan (100) is provided in the circulation pipe (11); An upstream static pressure sensor (21) and a downstream static pressure sensor (22) are respectively arranged on both sides of the installation position, and are used to measure the static pressure upstream and downstream of the tested fan (100), and the difference between the static pressure upstream and downstream of the tested fan (100) is the pressure difference; A total pressure sensor (23), arranged downstream of the installation position, for measuring the total pressure in the circulation pipeline (11); A downstream temperature sensor (32), arranged downstream of the installation position, opposite to the downstream static pressure sensor (22), and used for measuring the static temperature at the test section where the downstream static pressure sensor (22) is located; The control and display cabinet (18) is connected to the upstream static pressure sensor (21), the downstream static pressure sensor (22), the total pressure sensor (23), and the downstream temperature sensor (32); and is used to obtain the volume flow rate of the tested fan (100) according to the inner diameter of the circulation pipeline (11), the total pressure in the circulation pipeline (11), the static pressure upstream and downstream of the tested fan (100), and the static temperature at the test section where the downstream static pressure sensor (22) is located; and to fit a fitting curve of the pressure difference and the volume flow rate of the tested fan (100) under the current environment according to the corresponding relationship between multiple groups of pressure difference and volume flow rate.

2. The airborne fan product performance test bench according to claim 1 is characterized in that: The control and display cabinet (18) is also used to connect with the tested fan (100), change the rotation speed of the tested fan (100), and fit a family of fitting curves of the pressure difference and the volume flow rate of the tested fan (100) under different rotation speed conditions in the current environment according to the corresponding relationship between the pressure difference and the volume flow rate under different rotation speed conditions.

3. The airborne fan product performance test bench according to claim 1 is characterized in that: The circulation pipeline (11) is provided with an air outlet and an air inlet, and the system further comprises: A vacuum pump (13), connected to the gas outlet through a gas outlet pipe, for extracting gas from the circulation pipeline (11); An air supply pipe (14) is communicated with the air inlet, and an air supply valve (15) is provided on the air supply pipe (14).

4. The airborne fan product performance test bench according to claim 1 is characterized in that: The circulation pipeline (11) is provided with a heater (16).

5. The airborne fan product performance test bench according to claim 1 is characterized in that: It also includes a refrigeration subsystem (17), wherein the refrigeration subsystem (17) includes an evaporator (171), an electronic expansion valve (172), a condenser (173) and a compressor (174) which are connected to each other, and the evaporator (171) is connected to the circulation pipeline (11).

6. The airborne fan product performance test bench according to any one of claims 1 to 5, characterized in that: The invention also comprises a sealed tank, wherein the sealed tank comprises a tank body (111) and a partition (112) fixed inside the tank body (111), wherein the partition (112) is connected inside and outside so that the circulation pipeline (11) is formed inside the tank body (111).

7. The airborne fan product performance test bench according to claim 6, characterized in that: The separator (112) is a separator tube with openings at both ends, which is arranged in the middle of the tank body (111), and a mounting position for the tested fan (100) is arranged in the separator tube.

8. The airborne fan product performance test bench according to claim 1 is characterized in that: It also includes an upstream temperature sensor (31) disposed upstream of the installation position and used to measure the static temperature upstream of the installation position. The control and display cabinet (18) is connected to the upstream temperature sensor (31) and is used to obtain the temperature rise of the tested fan (100) under different pressure differences and different flow conditions based on the static temperatures upstream and downstream of the installation position.

9. The airborne fan product performance test bench according to claim 1, characterized in that: It also includes an ammeter and a voltmeter electrically connected to the tested fan (100) to measure the current and voltage of the tested fan (100); the control and display cabinet (18) is connected to the ammeter and the voltmeter to obtain an efficiency curve of the tested fan (100) based on the current and voltage of the tested fan (100) and the pressure difference and flow rate of the tested fan (100).

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